BEAM SWITCHING AFTER PERFORMING LISTEN-BEFORE-TALK
Apparatuses, methods, and systems are disclosed for beam switching after LBT procedure. One apparatus includes a processor coupled with at least one memory and configured to cause the apparatus to perform a first listen-before-talk (LBT) procedure using omni-directional sensing to acquire a first channel occupancy time (COT); transmit a first transport block (TB) during the first COT based on a successful result of the first LBT procedure, wherein transmission of the first TB uses a first beam and occupies a first portion of the first COT less than an entirety of the first COT; and perform a second LBT procedure using directional sensing to acquire a remaining portion of the first COT.
1 . A user equipment (UE) apparatus comprising:
a memory; and
a processor coupled with the memory and configured to cause the UE to:
perform a first listen-before-talk (LBT) procedure using omni-directional sensing to acquire a first channel occupancy time (COT);
transmit a first transport block (TB) during the first COT based on a successful result of the first LBT procedure, wherein transmission of the first TB uses a first beam and occupies a first portion of the first COT less than an entirety of the first COT; and
perform a second LBT procedure using directional sensing to acquire a remaining portion of the first COT.
2 . The UE of claim 1 , wherein to perform the second LBT procedure the processor is configured to cause the UE to perform a directional LBT procedure using a second beam different than the first beam.
3 . The UE of claim 1 , wherein a duration of the first LBT procedure is greater than a duration of the second LBT procedure.
4 . The UE of claim 1 , wherein to perform the first LBT procedure the processor is configured to cause the UE to perform an LBT procedure on unlicensed radio spectrum with a random back-off and with a variable size contention window.
5 . The UE of claim 4 , wherein the first LBT procedure comprises a category-4 type LBT procedure.
6 . The UE of claim 1 , wherein to perform the second LBT procedure the processor is configured to cause the UE to perform an LBT procedure unlicensed radio spectrum without random back-off.
7 . The UE of claim 6 , wherein the first LBT procedure comprises a category-2 type LBT procedure.
8 . The UE of claim 1 , wherein to perform the first LBT procedure the processor is configured to cause the UE to concurrently perform a plurality of directional LBT procedures for all configured beams.
9 . The UE of claim 1 , wherein the processor is configured to cause the UE to transmit a second TB during the remaining portion of the first COT based on a successful result of the second LBT procedure, wherein transmission of the second TB uses a second beam different than the first beam.
10 . The UE of claim 9 , wherein a time gap between transmission of the first TB and transmission of the second TB is less than or equal to 25 microseconds.
11 . A method of a user equipment (UE), the method comprising:
performing a first listen-before-talk (LBT) procedure using omni-directional sensing to acquire a first channel occupancy time (COT);
perform a first listen-before-talk (LBT) procedure using omni-directional sensing to acquire a first channel occupancy time (COT);
transmit a first transport block (TB) during the first COT based on a successful result of the first LBT procedure, wherein transmission of the first TB uses a first beam and occupies a first portion of the first COT less than an entirety of the first COT; and
perform a second LBT procedure using directional sensing to acquire a remaining portion of the first COT.
12 . The method of claim 11 , wherein performing the first LBT procedure comprises performing a directional LBT procedure using a second beam different than the first beam.
13 . The method of claim 11 , wherein a duration of the first LBT procedure is greater than a duration of the second LBT procedure.
14 . The method of claim 11 , wherein performing the first LBT procedure comprises performing an LBT procedure on unlicensed radio spectrum with a random back-off and with a variable size contention window.
15 . The method of claim 14 , wherein the first LBT procedure comprises a category-4 type LBT procedure.
16 . The method of claim 11 , wherein performing the first LBT procedure comprises performing an LBT procedure unlicensed radio spectrum without random back-off.
17 . The method of claim 16 , wherein the first LBT procedure comprises a category-2 type LBT procedure.
18 . The method of claim 11 , wherein performing the first LBT procedure comprises concurrently performing a plurality of directional LBT procedures for all configured beams.
19 . The method of claim 11 , further comprising transmitting a second TB during the remaining portion of the first COT based on a successful result of the second LBT procedure, wherein transmission of the second TB uses a second beam different than the first beam.
20 . A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by one or more processors to:
perform a first listen-before-talk (LBT) procedure using omni-directional sensing to acquire a first channel occupancy time (COT);
transmit a first transport block (TB) during the first COT based on a successful result of the first LBT procedure, wherein transmission of the first TB uses a first beam and occupies a first portion of the first COT less than an entirety of the first COT; and
perform a second LBT procedure using directional sensing to acquire a remaining portion of the first COT.